Journal of Taiwan Agricultural Research

Author:Chong-Yi Liao, Pei-Tzu Liao, and Chi-Ling Chen*

Abstract:

    Groundwater is one of water resources for agricultural irrigation in Taiwan. However, the arsenic (As) content is higher than the As criteria of irrigation water (0.05 mg L^-1) in some locations. The objective of the study is to find out a better removal method to diminish As concentration in groundwater. The lab-scale tests were attempted to compare the effectiveness of different methods such as chemical coagulation, ion-exchange, electro-coagulation, absorption, and oxidation precipitation. Some removal tests based on the lab data were conducted with 2 Mg volume groundwater at field experiments. The results revealed that the ferric chemical coagulation and oxidation precipitation method had higher efficiency in field studies. It required 1–30 d to the whole course of treatment based on different methods. The storage facilities are necessary for field application so that these methods are suitable for greenhouse or drip irrigation.

Key words:Groundwater, Arsenic, Ferric chemical coagulation, Oxidation precipitation

Download: PDF Links